“The Arctic Fusion 550R is a very small, silent and cheap power supply delivering efficient performance for your mid range equipment. The Fusion R is the upgraded PSU from the previous Fusion; the differences are increase in voltage to give more reliable efficiency. This PSU is equipped with its own external 80mm fan. With an efficiency of 82 to 86%, the Fusion 550 is very efficient. This eco-friendly power supply unit protects the environment and saves energy costs for you as well. Even when the PC is switched off, the low standby power consumption of the Fusion 550 helps to save energy.”